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      1 /* Scalar evolution detector.
      2    Copyright (C) 2003-2022 Free Software Foundation, Inc.
      3    Contributed by Sebastian Pop <s.pop (at) laposte.net>
      4 
      5 This file is part of GCC.
      6 
      7 GCC is free software; you can redistribute it and/or modify it under
      8 the terms of the GNU General Public License as published by the Free
      9 Software Foundation; either version 3, or (at your option) any later
     10 version.
     11 
     12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
     13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
     14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     15 for more details.
     16 
     17 You should have received a copy of the GNU General Public License
     18 along with GCC; see the file COPYING3.  If not see
     19 <http://www.gnu.org/licenses/>.  */
     20 
     21 #ifndef GCC_TREE_SCALAR_EVOLUTION_H
     22 #define GCC_TREE_SCALAR_EVOLUTION_H
     23 
     24 extern tree number_of_latch_executions (class loop *);
     25 extern gcond *get_loop_exit_condition (const class loop *);
     26 
     27 extern void scev_initialize (void);
     28 extern bool scev_initialized_p (void);
     29 extern void scev_reset (void);
     30 extern void scev_reset_htab (void);
     31 extern void scev_finalize (void);
     32 extern tree analyze_scalar_evolution (class loop *, tree);
     33 extern tree instantiate_scev (edge, class loop *, tree);
     34 extern tree resolve_mixers (class loop *, tree, bool *);
     35 extern void gather_stats_on_scev_database (void);
     36 extern bool final_value_replacement_loop (class loop *);
     37 extern unsigned int scev_const_prop (void);
     38 extern bool expression_expensive_p (tree);
     39 extern bool simple_iv_with_niters (class loop *, class loop *, tree,
     40 				   struct affine_iv *, tree *, bool);
     41 extern bool simple_iv (class loop *, class loop *, tree, struct affine_iv *,
     42 		       bool);
     43 extern bool iv_can_overflow_p (class loop *, tree, tree, tree);
     44 extern tree compute_overall_effect_of_inner_loop (class loop *, tree);
     45 
     46 /* Returns the basic block preceding LOOP, or the CFG entry block when
     47    the loop is function's body.  */
     48 
     49 static inline basic_block
     50 block_before_loop (loop_p loop)
     51 {
     52   edge preheader = loop_preheader_edge (loop);
     53   return (preheader ? preheader->src : ENTRY_BLOCK_PTR_FOR_FN (cfun));
     54 }
     55 
     56 /* Analyze all the parameters of the chrec that were left under a
     57    symbolic form.  LOOP is the loop in which symbolic names have to
     58    be analyzed and instantiated.  */
     59 
     60 static inline tree
     61 instantiate_parameters (class loop *loop, tree chrec)
     62 {
     63   return instantiate_scev (loop_preheader_edge (loop), loop, chrec);
     64 }
     65 
     66 /* Returns the loop of the polynomial chrec CHREC.  */
     67 
     68 static inline class loop *
     69 get_chrec_loop (const_tree chrec)
     70 {
     71   return get_loop (cfun, CHREC_VARIABLE (chrec));
     72 }
     73 
     74 #endif  /* GCC_TREE_SCALAR_EVOLUTION_H  */
     75